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<b><code>require 'quickfix_ruby'

def sendOrderCancelRequest
        message = Quickfix::Message.new();
        header = message.getHeader();

        header.setField(Quickfix::BeginString.new("FIX.4.2"))
        header.setField(Quickfix::SenderCompID.new(TW))
        header.setField(Quickfix::TargetCompID.new("TARGET"))
        header.setField(Quickfix::MsgType.new("D"))
        message.setField(Quickfix::OrigClOrdID.new("123"))
        message.setField(Quickfix::ClOrdID.new("321"))
        message.setField(Quickfix::Symbol.new("LNUX"))
        message.setField(Quickfix::Side.new(Side.BUY))
        message.setField(Quickfix::Text.new("Cancel My Order!"))

        Quickfix::Session.sendToTarget(message)
end
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